H2CAST Etzel
H2CAST Etzel is a hydrogen project in Germany; status: construction and testing; recorded capacity: up to 1TWh of hydrogen.
Overview
Statusconstruction and testing
Country · regionGermany
Technologyunderground hydrogen storage in salt caverns with purification, compression, and multicyclic operating modes
Producthydrogen
Capacityup to 1TWh of hydrogen
Capacity values retain their recorded units and scope. MW, kt H₂/y and Nm³ H₂/h are different measures; this page does not convert or add them without a shared operating basis. “Other Electrolysis” and “Unknown PtX” are recorded classifications, not a specific electrolyzer design or power-to-X route.
Details
Technology & product
Componentstwo existing salt caverns; above-ground facility
Configuration Detailconversion of two existing salt caverns and associated above-ground facilities for hydrogen storage
Status & timeline
Lifecycle Stagepilot project
Date online (tracker field)2007 (meaning under review)International Energy Agency · as of 2026
Additional project information
Progress StatusDemoInternational Energy Agency · as of 2026
Configuration DetailUnknown PtXInternational Energy Agency · as of 2026
ProductH2International Energy Agency · as of 2026
TechnologyOther ElectrolysisInternational Energy Agency · as of 2026
Timeline
No recorded project events.
Sources & record history
Sources
- Gasunie Gasunie and Storag Etzel start filling hydrogen caverns Shared by 6 fields: Current
- Bundesministerium für Wirtschaft und Energie / Energieforschung Salt caverns as flexible hydrogen storage facilities Shared by 3 fields: Current
- International Energy Agency IEA Hydrogen Projects dataset Shared by 5 fields: Snapshot 2026-06-18 · Confidence: reported · Older value (2026)
Field sources
Shared date, confidence and value status appear once with their source above; a dash in the table refers to that source context.
| Field | Shown value | Original value | Source | Date basis | Meaning |
|---|---|---|---|---|---|
| Name | H2CAST Etzel | View exact valueH2CAST Etzel | Gasunie and Storag Etzel start filling hydrogen caverns | — | |
| Country | Germany | View exact valueGermany | Gasunie and Storag Etzel start filling hydrogen caverns | — | |
| Components | two existing salt caverns; above-ground facility | View exact valuetwo existing salt caverns; above-ground facility | Salt caverns as flexible hydrogen storage facilities | — | |
| Configuration Detail | conversion of two existing salt caverns and associated above-ground facilities for hydrogen storage | View exact valueconversion of two existing salt caverns and associated above-ground facilities for hydrogen storage | Gasunie and Storag Etzel start filling hydrogen caverns | — | |
| Product | hydrogen | View exact valuehydrogen | Gasunie and Storag Etzel start filling hydrogen caverns | — | |
| Technology | underground hydrogen storage in salt caverns with purification, compression, and multicyclic operating modes | View exact valueunderground hydrogen storage in salt caverns with purification, compression, and multicyclic operating modes | Salt caverns as flexible hydrogen storage facilities | — | |
| Capacity | up to 1TWh of hydrogen | View exact valueup to 1TWh of hydrogen | Gasunie and Storag Etzel start filling hydrogen caverns | — | |
| Event | Date online : 2007 | View exact value{"date":"2007","date_precision":"year","event":"Date online","basis":"iea_hydrogen_projects_raw.csv"} | IEA Hydrogen Projects dataset | — | — |
| Lifecycle Stage | pilot project | View exact valuepilot project | Gasunie and Storag Etzel start filling hydrogen caverns | — | |
| Progress Status | construction and testing | View exact valueconstruction and testing | Salt caverns as flexible hydrogen storage facilities | — | |
| Progress Status | Demo | View exact valueDEMO | IEA Hydrogen Projects dataset | — | — |
| Configuration Detail | Unknown PtX | View exact valueUnknown PtX | IEA Hydrogen Projects dataset | — | — |
| Product | H2 | View exact valueH2 | IEA Hydrogen Projects dataset | — | — |
| Technology | Other Electrolysis | View exact valueOther Electrolysis | IEA Hydrogen Projects dataset | — | — |
Record history
8 current sourced values · 1 older value · Record updated